What kind of lighting gear should I consider for macro shooting?

Something like a hotshoe mounted Lume Cube is probably about the worst option. With macro you are going to need to get the light forward and around the lens... this is my typical setup (if it's not just natural light)... Nikon1 V2, Sigma 150/2.8, SB800, 12" softbox thing.

The "classic" answer is a ring flash or macro flash.

Canon sells the Canon MR-14EX II Macro Ring Lite:

and the Canon MT-26EX-RT Macro Twin Lite:

The latter is a newer unit that can also control Canon RT flashes (and third party RT clones) via wireless radio. Do note that the two heads included with the MT-26X RT can detach from the central bracket to modify placement, but they are only controllable via the cables connecting them to the main unit in the camera's hot shoe.

They're both a bit pricey, as are most of Canon's flashes, but there are plenty of third party clones on the market as well.

Regardless of Canon or third party, be sure to confirm the unit will fit on your lens. Note that both list the EF 100mm f/2.8 L Macro as compatible, but if using the EF 100mm f/2.8 L Macro IS USM lens with either, the separate Macrolite Adapter 67 (or a third party knock-off) is required; if using the EF 180mm f/3.5L Macro USM lens, the separate Macrolite Adapter 72C is required. Any lens with filter threads larger than 72mm are not compatible with either unit.

The 100mm macro lens is great for portraits too. The sun as suggested with appropriate shade and use of a reflector should give some great results if you do branch off.

On the macro side you can take longer exposures in available lighting. When photographing moving subjects like insects though be prepared to be out shooting when the air temperature is cool and the subject is still warming up. There could be some dew about then too for enhanced effect.

The ring flash mentioned also has two lights and by setting the levels independently you can start to introduce subject texture as straight on flash looks rather flat.